3 budget 3x Barlows

[felo-4061]

Hi

I am looking for a 3x barlow to use for imaging with my telescope. I have been trying to pick up the long GSO ED x3 but it is out of stock...

There are only 3 budget barlows available after that and I'm wondering if any of them are worthwhile.

The first is this "Achromatic, multicoated, cemented doublet" from 365Astronomy

https://www.365astronomy.com/365Astronomy-1.25-2x-LONG-Achromatic-Barlow-VSB36501-LONG-2X1.html

 

Then there's this "Universal broadband multicoated, internally blackened" one from Harrison Telescopes

https://www.harrisontelescopes.co.uk/acatalog/universal-3x-barlow.html#SID=564

And finally this "High Quality Fully Multicoated One"...bit of a standard, suspicious-looking design??

https://www.rothervalleyoptics.co.uk/rvo-x3-barlow-lens-with-t-thread-125.html

Any of them worth anything, or does anyone have any experience with them?

Edited December 7, 2020 by felo-4061

[Zermelo]

The GSO 3x says "in stock" at 365astronomy, did you try them?

I recall a previous conversation that a lot of these sub-£50 barlows are identical under the covers but badged up differently. Isn't the GSO the same as this Revelation Astro model? (although that's showing low stock too, but it may be available elsewhere)

No doubt others will correct me if I mis-remembered.

 

[felo-4061]

I am now doubting myself about a long GSO/similar 3x Barlow for that reason: they're long and I'll be using them for solar system photography.

It's probably between these 3...